Quantum dot–induced phase stabilization of α-CsPbI3 perovskite for high-efficiency photovoltaics

• Autores: Abhishek Swarnkar, Ashley R. Marshall, Tamoghna Chakrabarti
• Localización: Science, ISSN 0036-8075, Vol. 354, Nº 6308, 2016, págs. 93-95
• Idioma: inglés
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• Resumen

  • We show nanoscale phase stabilization of CsPbI3 quantum dots (QDs) to low temperatures that can be used as the active component of efficient optoelectronic devices. CsPbI3 is an all-inorganic analog to the hybrid organic cation halide perovskites, but the cubic phase of bulk CsPbI3 (α-CsPbI3)—the variant with desirable band gap—is only stable at high temperatures. We describe the formation of α-CsPbI3 QD films that are phase-stable for months in ambient air. The films exhibit long-range electronic transport and were used to fabricate colloidal perovskite QD photovoltaic cells with an open-circuit voltage of 1.23 volts and efficiency of 10.77%. These devices also function as light-emitting diodes with low turn-on voltage and tunable emission.